mkinitramfs reproducible fonts uuid

[Otto Ersek]

Dear all,

I am trying to do some reproducible builds of the daily isos and noticed that in chroot with a daily xubuntu Jammy iso mkinitramfs fails to create a reproducible initrd by setting random uuid's and filenames in the initrd:

main/usr/share/fonts/.uuid
main/usr/share/fonts/truetype/.uuid
main/usr/share/fonts/truetype/ubuntu/.uuid

main/usr/local/share/fonts/.uuid

main/var/cache/fontconfig/***random-file-names***

[Benjamin Drung (bdrung)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. I can see the /var/cache/fontconfig files in the initrd on Ubuntu 23.04 as well:

```
$ lsinitramfs /boot/initrd.img | grep -i font
etc/fonts
etc/fonts/conf.d
etc/fonts/conf.d/60-latin.conf
etc/fonts/fonts.conf
usr/bin/setfont
usr/bin/loadfont
usr/lib/x86_64-linux-gnu/libfontconfig.so.1
usr/lib/x86_64-linux-gnu/libfontconfig.so.1.12.0
usr/local/share/fonts
usr/share/fonts
usr/share/fonts/truetype
usr/share/fonts/truetype/ubuntu
usr/share/fonts/truetype/ubuntu/UbuntuMono-Italic[wght].ttf
usr/share/fonts/truetype/ubuntu/UbuntuMono[wght].ttf
usr/share/fonts/truetype/ubuntu/Ubuntu[wdth,wght].ttf
var/cache/fontconfig
var/cache/fontconfig/2300eef321c393bfd76478a5c0e95b23-le64.cache-8
var/cache/fontconfig/3830d5c3ddfd5cd38a049b759396e72e-le64.cache-8
var/cache/fontconfig/4c599c202bc5c08e2d34565a40eac3b2-le64.cache-8
var/cache/fontconfig/7ef2298fde41cc6eeb7af42e48b7d293-le64.cache-8
var/cache/fontconfig/CACHEDIR.TAG
```